Hier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten.

Diffraction properties of ordered arrays of large latex particles

: Goldenberg, L.M.; Wagner, J.; Stumpe, J.; Paulke, B.-R.; Görnitz, E.


Materials Science and Engineering, C. Biomimetic and supramolecular systems Biomimetic materials, sensors and systems 22 (2002), Nr.2, S.233-237
ISSN: 0928-4931
Fraunhofer IAP ()
large latex particle; ordered array; ordered monolayer; multilayer film; monodisperse latex particle; preparation technique; Langmuir-Schafer deposition; natural sedimentation; slow drying; high humidity atmosphere; flow cell deposition; vertical deposition; structures; diffraction properties; laser beam probe; diffraction optical microscopy; Bertrand lens; stop-band; NIR region; reflectance spectra; array quality; Fabry-Perot fringes; main Bragg peak; ordered area size; microscope spectroscopy; 2D fast Fourier transformation; optical microscopic picture; visible reflection spectra; photonic crystal; 0.2 to 6 micron

Ordered monolayer and multilayer films of monodisperse 0.2-6 mu m latex particles were manufactured using different preparation techniques: Langmuir-Schafer deposition, natural sedimentation, slow drying in high humidity atmosphere, flow cell and vertical deposition. The structures of the films were investigated. Diffraction properties were studied using a laser beam as a probe and by the diffraction optical microscopy with Bertrand lens. For the first time, the stop-bands were observed in the NIR region up to 3200 nm in the reflectance spectra. The array quality is confirmed by the observation of Fabry-Perot fringes in the vicinity of the main Bragg peak. The size of ordered area was estimated by microscope spectroscopy and 2-D fast Fourier transformation (2D-FFT) of optical microscopic pictures.